Kubota hydrostat fluid out of the breather

[Steelphoenix]

I have a 2000 L3710 Grand HST that suddenly started blowing all of the fluid out of the transmission breather. I mean it pours out. Everything, FEL and PTOs and drive work fine.
I changed the hydro filter and that didn't help. I did recently change all of the loader lines but that was 10 hours runtime ago.
Tractor has 780 hrs. on it.
Any help would be greatly appreciated!

 

[oldnslo]

Does the oil look foamy or is it pretty much clear oil?

Did you recently remount the fel or any other changes to hydraulic circuit before this happened?

 

[MountainBuck]

I'm suspecting a couple of issues.

I'd look at possibly the relief valve stuck closed.

But it might just be overfilling of the hydraulic system since you recently worked on it.

 

[Steelphoenix]

Does the oil look foamy or is it pretty much clear oil?

Did you recently remount the fel or any other changes to hydraulic circuit before this happened?

The oil is clear and it just runs out of the hydrostat breather until its empty. I did change the FEL hoses but it worked fine for 10 hrs. After the problem started I changed the filter but no help.

 

[Steelphoenix]

I'm suspecting a couple of issues.

I'd look at possibly the relief valve stuck closed.

But it might just be overfilling of the hydraulic system since you recently worked on it.

I can rule out overfilled as it just empties the system. Which relief valve are you referring to?

 

[MountainBuck]

It should be on the pump housing.

Here is an example on a different Kubota tractor.